ios开发级联菜单（利用父子控制器--两个菜单封装为两个子控制器来实现）

 1 #import "ViewController.h"
 2 #import "RHCategoryViewController.h"
 3 #import "RHSubCategoryViewController.h"
 4 @interface ViewController ()
 5 
 6 @end
 7 
 8 @implementation ViewController
 9 
10 - (void)viewDidLoad {
11     [super viewDidLoad];
12     
13     
14     CGFloat width = self.view.frame.size.width *0.5;
15     CGFloat height = self.view.frame.size.height;
16     //右侧菜单
17     RHSubCategoryViewController *sub = [[RHSubCategoryViewController alloc]init];
18     sub.view.frame = CGRectMake(width, 0, width, height);
19     [self addChildViewController:sub];
20     [self.view addSubview:sub.view];
21     
22     //左侧菜单
23     RHCategoryViewController *category = [[RHCategoryViewController alloc]init];
24     category.view.frame = CGRectMake(0, 0, width, height);
25     category.delegate = sub;
26     [self.view addSubview:category.view];
27     [self addChildViewController:category];
28 
29    
30     
31    
32 }
33 
34 
35 @end

 1 //左侧菜单：
 2 
 3 #import <UIKit/UIKit.h>
 4 @class RHCategoryViewController;
 5 @protocol RHCategoryViewControllerDelegate <NSObject>
 6 
 7 @optional
 8 
 9 - (void)categoryViewController:(RHCategoryViewController*)controller didSelectRowWithData:(NSArray*)dataArr;
10 
11 @end
12 
13 @interface RHCategoryViewController : UITableViewController
14 
15 @property (nonatomic,weak)id <RHCategoryViewControllerDelegate>delegate;
16 
17 @end

  1 #import "RHCategoryViewController.h"
  2 #import "RHCategoryModel.h"
  3 static NSString *const cellID = @"cellID";
  4 @interface RHCategoryViewController ()
  5 /*数据源*/
  6 @property (nonatomic ,strong)NSMutableArray *dataArr;;
  7 
  8 @end
  9 
 10 @implementation RHCategoryViewController
 11 
 12 - (NSMutableArray*)dataArr {
 13     
 14     if (!_dataArr) {
 15         NSString *filePath = [[NSBundle mainBundle]pathForResource:@"categories" ofType:@"plist"];
 16         NSArray *data = [NSArray arrayWithContentsOfFile:filePath];
 17         NSMutableArray *dataArray = [NSMutableArray array];
 18         for (NSDictionary *dic in data) {
 19             RHCategoryModel *model = [RHCategoryModel categoryModelWithDic:dic];
 20             [dataArray addObject:model];
 21         }
 22         /*
 23          1:此时的数组可以自己初始化，或是将其他的数组赋值给没初始化的数组 2：在懒加载还可以调用set方法为数组赋值，也就是，self.dataArr = dataArray;
 24          */
 25         _dataArr = dataArray;
 26     }
 27     
 28     return _dataArr;
 29 }
 30 
 31 - (void)viewDidLoad {
 32     [super viewDidLoad];
 33     //1:注册表格
 34     [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:cellID];
 35     
 36     /*
 37      注： 1：写在viewDidLoad此处不会默认选中第一行，应该在viewWillAppear:(BOOL)animated，或是viewDidAppear:(BOOL)animated方法中设置默认选中第一行时，才会选中
 38          2：控制器的view是懒加载的，当在根控制器中设置view的frame时，vc.view.frame,vc.view调用的是vc中view的get方法，此时会加载view，执行viewDidload方法，加载view，但是此时view的UI，tableView还没有加载，先调用viewWillAppear:(BOOL)animated，在调用数据源代理方法，在调用viewDidAppear:(BOOL)animated
 39      //2:默认第0行被选中
 40      //     [self.tableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] animated:NO scrollPosition:UITableViewScrollPositionTop];
 41      */
 42    
 43 }
 44 
 45 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
 46     
 47     return self.dataArr.count;
 48 }
 49 
 50 - (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
 51     /*
 52      1:当cell被选中的时候，cell上的子控件都会显示高亮行为，所以可以设置cell上子控件高亮时的状态，来显示cell被选中时的状态。 cell.textLabel.highlightedTextColor，cell.imageView.highlightedImage
 53      */
 54     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
 55     RHCategoryModel *model = self.dataArr[indexPath.row];
 56     cell.textLabel.text = model.name;
 57     cell.textLabel.highlightedTextColor = [UIColor orangeColor];
 58     cell.imageView.image = [UIImage imageNamed:model.icon];
 59     cell.imageView.highlightedImage = [UIImage imageNamed:model.highlighted_icon];
 60     cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
 61     return cell;
 62 }
 63 
 64 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
 65     
 66     if (self.delegate && [self.delegate respondsToSelector:@selector(categoryViewController:didSelectRowWithData:)]) {
 67         RHCategoryModel *model = self.dataArr[indexPath.row];
 68         [self.delegate categoryViewController:self didSelectRowWithData:model.subcategories];
 69       
 70     }
 71 }
 72 
 73 - (void)setDelegate:(id<RHCategoryViewControllerDelegate>)delegate {
 74     
 75     _delegate = delegate;
 76     /*
 77      1:默认表格的某一行被选中，不会调用didSelectRowAtIndexPath方法，只是设置cell的选中的一个状态
 78      2：获得tableView选中的某一行的indexpath：self.tableView.indexPathForSelectedRow
 79      */
 80     [self tableView:self.tableView didSelectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
 81     
 82 }
 83 
 84 /*
 85  1：两方法分别是：视图即将出现的时候调用，视图已经出现的时候调用
 86  2：当某个控制器被压入栈里，或是被moda的控制器遮住的时候，返回到此控制器，则两个方法依然会被调用
 87  */
 88 - (void)viewWillAppear:(BOOL)animated {
 89     
 90     [super viewWillAppear:animated];
 91 //     [self.tableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] animated:NO scrollPosition:UITableViewScrollPositionTop];
 92 }
 93 
 94 - (void)viewDidAppear:(BOOL)animated {
 95     
 96     [super viewDidAppear:animated];
 97    
 98     [self.tableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] animated:NO scrollPosition:UITableViewScrollPositionTop];
 99     
100 }
101 @end

1 #import <UIKit/UIKit.h>
2 #import "RHCategoryViewController.h"
3 @interface RHSubCategoryViewController : UITableViewController<RHCategoryViewControllerDelegate>
4 
5 @end

 1 #import "RHSubCategoryViewController.h"
 2 #import "RHCategoryViewController.h"
 3 static NSString *const cellID = @"cellID";
 4 @interface RHSubCategoryViewController ()
 5 /*数据源*/
 6 @property (nonatomic ,strong)NSArray *dataArr;
 7 @end
 8 
 9 @implementation RHSubCategoryViewController
10 
11 - (void)viewDidLoad {
12     [super viewDidLoad];
13     [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:cellID];
14 }
15 
16 - (void)categoryViewController:(RHCategoryViewController *)controller didSelectRowWithData:(NSArray *)dataArr {
17     
18     self.dataArr = dataArr;
19     [self.tableView reloadData];
20 }
21 
22 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
23     
24     return self.dataArr.count;
25 }
26 
27 - (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
28     
29     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
30     cell.textLabel.text = self.dataArr[indexPath.row];
31     return cell;
32 }
33 
34 
35 @end

 1 #import <Foundation/Foundation.h>
 2 
 3 @interface RHCategoryModel : NSObject
 4 /*高亮图片*/
 5 @property (nonatomic,copy)NSString *highlighted_icon;
 6 /*icon*/
 7 @property (nonatomic,copy)NSString *icon;
 8 /*名字*/
 9 @property (nonatomic,copy)NSString *name;
10 /*分类数组*/
11 @property (nonatomic ,strong)NSArray *subcategories;
12 
13 +(instancetype)categoryModelWithDic:(NSDictionary*)dic;
14 @end

 1 #import "RHCategoryModel.h"
 2 
 3 @implementation RHCategoryModel
 4 
 5 +(instancetype)categoryModelWithDic:(NSDictionary*)dic {
 6     
 7     RHCategoryModel *model = [[self alloc]init];
 8     [model setValuesForKeysWithDictionary:dic];
 9     return model;
10 }
11 @end